Use Free Tools

Percentage Calculator

Solve every everyday percentage problem in seconds. Our free percentage calculator handles the three questions everyone asks: what is X% of Y, X is what percent of Y, and what is the percentage change between two numbers. Perfect for discounts, tips, grades, commissions, and growth rates.

  • Free, no signup
  • Runs in your browser
  • Works on mobile

What is X% of Y?

X is what percent of Y?

Percentage change from X to Y

Increase or decrease X by Y%

How to use the Percentage Calculator

  1. Find the calculation you need: percent of a number, what percent one number is of another, percentage change, or increase/decrease by a percent.
  2. Type your two numbers into that row.
  3. The answer appears as you type, with the full working underneath so you can check it.
  4. For percentage change, the result shows whether it is an increase or a decrease and by how much.

About this tool

Covers the everyday percentage problems: discounts, marks, tips, tax, growth rates, salary raises and exam scores. Results are exact to four decimal places, and percentage change correctly handles negative starting values.

Why use itFrom sale prices to exam scores to investment returns, percentages run daily life — and mental math under pressure leads to embarrassing mistakes at the checkout or in the meeting room. Our tool gives instant, exact answers for all three classic percentage problems, including whether a change is an increase or a decrease, so you always know the real number before you decide.

Frequently asked questions

How do I calculate a discount?

Use 'Increase or decrease X by Y%' with a negative percent: 1,500 decreased by 20% is 1,200. Or use 'What is X% of Y?' to get the discount amount itself: 20% of 1,500 is 300.

What exactly is percentage change?

(New − Old) ÷ Old × 100. A positive result is an increase and a negative one a decrease — for example, going from 100 to 150 is a 50% increase.

How do I find the original price after a discount?

Divide what you paid by (1 − discount rate): paid $800 after 20% off → $800 ÷ 0.8 = $1,000 original price.

What's the difference between percent and percentage points?

Going from 10% to 15% is a 5-percentage-point rise but a 50% relative increase. Our change calculator gives you the relative figure, which is what most people mean.